Petrol in a Diesel Car in Haddenham: How Worried Should You Be?
Far less than you probably are, if it has not been started. Till the ignition primes your pump, the starter turns, or the vehicle is driven, petrol in a diesel tank simply sits there and does nothing. Which means the honest reply to the first Haddenham question — "have I ruined it?" — normally no. Leave your engine off and phone Petrol in Diesel — that is how you keep it like that. Keep reading for three things: the effect petrol has inside a diesel engine, the clues of how far it has spread, and ways to make sure you don't repeat it.
Inside the motor: what petrol in a diesel really does
On its way through a motor, diesel has two jobs. It combusts, and before it combusts it lubricates. What keeps the surfaces inside the high-pressure fuel pump and the fuel injectors from wearing down against one another is the diesel passing through them — they are built to extremely fine gaps.
The second task petrol doesn't do at all, and the first it does poorly. Being less viscous than diesel, petrol strips away the protection a fuel system needs, so a pump on the mixture wearing itself. It's equally made to resist igniting under compression — the opposite of what a diesel needs — which is where you hear the clattering.
Taken together, they show what shape the issue has. The harm is done by movement, not by contact. All a tank with petrol in it amounts to is a fuel problem. A pump that has been running on that petrol is the start of a mechanical one, and whatever a worn pump sheds moves on with your fuel to the fuel injectors further on.
Petrol in a diesel in Haddenham: how serious is it? Four cases
Fuelled but never started — as good as it gets. Being on a forecourt is what makes this possible: elsewhere, your car has been driven there to begin with. With that petrol held in the tank alone, it is cleared and purged on the spot, and nothing more is needed.
Started for a moment, or only the ignition on. Once primed, your system has drawn petrol out of your tank up to the fuel filter and your lines. Still generally easy: drain, flush, and the filter seen to.
Your pump has spent a couple of miles on weakened fuel — that's what driving it meant. How hard the car was driven matters as much as how far, and the work takes in that tank, the lines, the filter and clean fuel through the whole circuit. Short trips, like the school run to Haddenham St Mary's Church of England School, are one thing. Any mileage on the M40, under 10 miles from Haddenham, means the engine has worked hard throughout, and a run to Oxford, under 15 miles away, is a very different job as well.
It protested, and only then stopped: smoke, clattering, a throttle gone soft, an idle gone lumpy. The fuel is not acting like diesel any more, and the motor is telling you. Pull up on the spot — on the verge on Crabtree Road, at the kerb, down a side road — and don't move it again. A vehicle stopped early very rarely has permanent damage, as the drain and the flush-through, which still go first, take care of it.
What Haddenham drivers get told about petrol in a diesel — and the myths in it
False: topping up to full with diesel makes it fine. It doesn't. Nothing is removed by topping up — you are left with a bigger tank, still the same mixture. The idea behind that advice — that diesel fuel systems tolerate petrol by percentage — is wrong.
"Current diesels can handle a little petrol" — a myth, and closer to the reverse. Smaller parts and higher pressure are the way a newer diesel runs its fuel, and that makes the lubrication matter more, not less.
"It starts, it drives, and so there is no harm" — the myth that trips up more drivers than any other. Diesel in a petrol motor normally leaves a motor that will not run: the motorist stops, and so does the harm. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually will; meanwhile your pump wears. Running isn't the same as fine.
Myth: "Add some two-stroke oil and drive the vehicle home." It's an old fix for a separate fault. None of what petrol diluted is put back by it — and afterwards, the tank still contains that petrol.
"Drain it yourself and you're sorted" — a myth, since after it's been running some petrol sits in your filter and lines, ready to go right back through your pump on your next start. Also, a can of petrol drained by the roadside is genuinely hazardous.
How petrol ends up: petrol in a diesel
No one does it on purpose, and it's rarely carelessness. The forecourt makes it easy: the petrol nozzle is the smaller of the two, and it slips into a diesel filler with almost no resistance, whilst a diesel nozzle generally will not go into a petrol motor at all. So the slip runs one way.
Routine and the car getting out of step is how it takes place. A new vehicle, a hire car or a courtesy car. One petrol and one diesel on the driveway of the same household. A forecourt you know, only with its pumps arranged differently. Racing for a train at Haddenham & Thame Parkway and fuelling up en route. Precisely the moment it occurs: after years of driving petrol, someone fills a diesel Skoda Octavia for the first time. Throw in rain, a phone call or a back seat full of kids, and your hand repeats what it has always done.
Haddenham motorists: how to prevent petrol in a diesel next time
- Not every forecourt in the UK follows green for unleaded and black for diesel, though most generally do. Check the pump's label; the colour is only a hint.
- Plenty of vehicles state the fuel inside your filler flap or on the cap, and so check there on the first fill in a vehicle you don't know.
- Label the key. In a home with one of each, a coloured fob or a sticker on your diesel's key does more than any amount of intending to remember.
- Say it before you lift it. On the first fill in a new or hired car, say "diesel" aloud before you take the nozzle off the pump. It sounds silly and it does the trick.
- Put the phone away. This is an easy mistake to make whilst you are thinking about something else.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler built to reject a petrol nozzle, and aftermarket devices are available for the rest. Treat it as a safety net, then keep reading the petrol pump.
- Less petrol means a weaker blend, so stop as soon as you realise — while remembering that the next stage is unchanged. It is still not to crank it.
Already put petrol in a diesel around Haddenham?
Then, there is only a short order of things. Never fire it up, and do not turn the ignition on. The staff on the forecourt — whether at Gulf itself or wherever you filled up — will usually help push it away from the pump if you ask. Then ring 0333 366 0103 and tell us what went in, roughly how much, and whether it's run.
Corrosion and deposits form the issue with AdBlue, whereas petrol brings lost protection. So if it was AdBlue, say so — and read its own Haddenham page.
Haddenham petrol in a diesel tasks: why one costs more than another
The four scenarios above are four different tasks, so no single quote for this would be fair. Mostly, the cost moves with which one you're in. Where your car is counts too, and whether a technician can safely reach it, after the ratio of petrol to what the tank holds.
Three queries come first, before any quote, instead of after — what got in, how much, has it run — and this is the reason. With those replies, you get a straight figure rather than a range.
About Haddenham and where it is
Haddenham is a village in Buckinghamshire, situated in the inland countryside of the South East region, with an elevation of around 79 metres. Haddenham lies near the villages of Fort End, Diggs, and Church End, and is approximately 14 miles from Oxford. Haddenham has a population of around 1959 people, predominantly living in detached houses. Haddenham is also within commuting distance of London, being around 39 miles from the capital.
Across Buckinghamshire and in Haddenham: fuel drain cover
Petrol in diesel call-outs around Haddenham — part of the HP postcode area — go to vans that likewise cover the spots around it, Fort End, Diggs and Church End included. Our engineers drain where your car is — your own drive, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
Still at the petrol pump in Haddenham?
Then you are in the best position there is. Leave the vehicle turned off, and ring.